1
|
Keller T, Koepsell H, Groll J. Evaluation of the Influence of Biosurface Design on the Interaction between the Regulatory Peptide RS1-reg and ODC1 Reveals a Membrane-Dependent Affinity Increase. Adv Biol (Weinh) 2022; 6:e2101108. [PMID: 35735188 DOI: 10.1002/adbi.202101108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 05/07/2022] [Indexed: 01/28/2023]
Abstract
The regulatory solute carrier protein, family 1, member 1 (RS1) modulates via its N-terminal domain RS1-reg the activity of Na+ -d-glucose cotransporter 1 (SGLT1) and thereby the glucose uptake in the small intestine by blocking the release of SGLT1-containing vesicles at the trans-Golgi network (TGN). The antidiabetic activity of RS1 is mediated by ornithindecarboxylase 1 (ODC1), catalyzing the conversion of ornithine to putrescine. Putrescine can bind to a buddying protein complex for SGLT1-containing vesicles at the membrane of the TGN, triggering vesicle release. In this report, a first in-depth analysis of the important binding process between ODC1 and RS1-reg for regulating glucose uptake in the human organism is described by comparing results from the surface-based methods, "surface plasmon resonance" (SPR) and "surface acoustic wave" (SAW) with findings by isothermal titration calorimetry (ITC). In cases of SAW and SPR, three different assay surface setups are compared, resulting in small but significant differences in KD values for different surfaces. Noteworthy, an affinity increase by the factor of about 100 for the interaction is detected and herewith described for the first time in the presence of biological membranes that may be relevant in vivo for the biological function of RS1 and future bespoken antidiabetic drug development.
Collapse
Affiliation(s)
- Thorsten Keller
- Department for Functional Materials in Medicine and Dentistry Pleicherwall 2, University of Würzburg, 97070, Würzburg, Germany
| | - Hermann Koepsell
- Institute of Anatomy and Cell Biology, University of Würzburg, Koellikerstraße 6, 97070, Würzburg, Germany
| | - Jürgen Groll
- Department for Functional Materials in Medicine and Dentistry Pleicherwall 2, University of Würzburg, 97070, Würzburg, Germany
| |
Collapse
|
2
|
Hanson SR, Tucker EI, Latour RA. Blood Coagulation and Blood–Material Interactions. Biomater Sci 2020. [DOI: 10.1016/b978-0-12-816137-1.00052-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
3
|
Renz AF, Reichmuth AM, Stauffer F, Thompson-Steckel G, Vörös J. A guide towards long-term functional electrodes interfacing neuronal tissue. J Neural Eng 2018; 15:061001. [DOI: 10.1088/1741-2552/aae0c2] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
4
|
Horbett TA. Fibrinogen adsorption to biomaterials. J Biomed Mater Res A 2018; 106:2777-2788. [PMID: 29896846 DOI: 10.1002/jbm.a.36460] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/16/2018] [Indexed: 01/28/2023]
Abstract
Fibrinogen (Fg) adsorption is an important mechanism underlying cell adhesion to biomaterials and was the major focus of the author's research career. This article summarizes our work on Fg adsorption, with citations of related work as appropriate. The molecular properties of Fg that promote adsorption and cell adhesion will be described. In addition, the adsorption behavior of Fg from buffer, binary solutions with other proteins, and blood plasma will be discussed, including the Vroman effect. Studies of platelet adhesion to surfaces preadsorbed with blood plasmas selectively deficient in Fg, vitronectin (Vn), fibronectin (Fn), or von Willebrand's factor (vWf) will be reviewed. These studies clearly showed a major role for Fg in platelet adhesion under static conditions and both Fg and vWf for adhesion from flowing suspensions, but no significant role for Vn or Fn. However, it was also shown that platelet adhesion was poorly correlated with the total amount of adsorbed Fg, but very well correlated with the binding of antibodies specific to the cell binding domains of Fg. A brief overview of nonfouling surfaces for prevention of Fg adsorption will be given. A more extensive discussion of structural changes in Fg after its adsorption is included, including changes detected with both physicochemical and biological methods. A short discussion of the state of the art of structural determination of adsorbed proteins with computational methods is also given. A final section identifies Fg adsorption as the single most important event determining the biocompatibility of implants in soft tissue and in blood. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2777-2788, 2018.
Collapse
Affiliation(s)
- Thomas A Horbett
- Departments of Bioengineering and Chemical Engineering, University of Washington, Seattle, Washington 98195
| |
Collapse
|
5
|
Xu LC, Bauer JW, Siedlecki CA. Proteins, platelets, and blood coagulation at biomaterial interfaces. Colloids Surf B Biointerfaces 2014; 124:49-68. [PMID: 25448722 PMCID: PMC5001692 DOI: 10.1016/j.colsurfb.2014.09.040] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/15/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022]
Abstract
Blood coagulation and platelet adhesion remain major impediments to the use of biomaterials in implantable medical devices. There is still significant controversy and question in the field regarding the role that surfaces play in this process. This manuscript addresses this topic area and reports on state of the art in the field. Particular emphasis is placed on the subject of surface engineering and surface measurements that allow for control and observation of surface-mediated biological responses in blood and test solutions. Appropriate use of surface texturing and chemical patterning methodologies allow for reduction of both blood coagulation and platelet adhesion, and new methods of surface interrogation at high resolution allow for measurement of the relevant biological factors.
Collapse
Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - James W Bauer
- Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Christopher A Siedlecki
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States.
| |
Collapse
|
6
|
Mi HY, Jing X, Salick MR, Cordie TM, Peng XF, Turng LS. Properties and fibroblast cellular response of soft and hard thermoplastic polyurethane electrospun nanofibrous scaffolds. J Biomed Mater Res B Appl Biomater 2014; 103:960-70. [DOI: 10.1002/jbm.b.33271] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/18/2014] [Accepted: 08/08/2014] [Indexed: 12/18/2022]
Affiliation(s)
- Hao-Yang Mi
- The Key Laboratory for Polymer Processing Engineering of Ministry of Education; South China University of Technology; Guangzhou 510640 China
- Wisconsin Institute for Discovery; University of Wisconsin-Madison; Madison Wisconsin 53715
- Department of Mechanical Engineering; University of Wisconsin-Madison; Madison Wisconsin 53706
| | - Xin Jing
- The Key Laboratory for Polymer Processing Engineering of Ministry of Education; South China University of Technology; Guangzhou 510640 China
- Wisconsin Institute for Discovery; University of Wisconsin-Madison; Madison Wisconsin 53715
- Department of Mechanical Engineering; University of Wisconsin-Madison; Madison Wisconsin 53706
| | - Max R. Salick
- Wisconsin Institute for Discovery; University of Wisconsin-Madison; Madison Wisconsin 53715
- Department of Engineering Physics; University of Wisconsin-Madison; Wisconsin 53706
| | - Travis M. Cordie
- Wisconsin Institute for Discovery; University of Wisconsin-Madison; Madison Wisconsin 53715
| | - Xiang-Fang Peng
- The Key Laboratory for Polymer Processing Engineering of Ministry of Education; South China University of Technology; Guangzhou 510640 China
| | - Lih-Sheng Turng
- Wisconsin Institute for Discovery; University of Wisconsin-Madison; Madison Wisconsin 53715
- Department of Mechanical Engineering; University of Wisconsin-Madison; Madison Wisconsin 53706
| |
Collapse
|
7
|
Leavesley DI, Kashyap AS, Croll T, Sivaramakrishnan M, Shokoohmand A, Hollier BG, Upton Z. Vitronectin--master controller or micromanager? IUBMB Life 2013; 65:807-18. [PMID: 24030926 DOI: 10.1002/iub.1203] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 07/18/2013] [Indexed: 11/07/2022]
Abstract
The concept that the mammalian glycoprotein vitronectin acts as a biological 'glue' and key controller of mammalian tissue repair and remodelling activity is emerging from nearly 50 years of experimental in vitro and in vivo data. Unexpectedly, the vitronectin-knockout (VN-KO) mouse was found to be viable and to have largely normal phenotype. However, diligent observation revealed that the VN-KO animal exhibits delayed coagulation and poor wound healing. This is interpreted to indicate that VN occupies a role in the earliest events of thrombogenesis and tissue repair. VN is the foundation upon which the thrombus grows in an organised structure. In addition to sealing the wound, the thrombus also serves to protect the underlying tissue from oxidation, is a reservoir of mitogens and tissue repair mediators, and provides a provisional scaffold for the repairing tissue. In the absence of VN (e.g., VN-KO animal), this cascade is disrupted before it begins. A wide variety of biologically active species associate with VN. Although initial studies were focused on mitogens, other classes of bioactives (e.g., glycosaminoglycans and metalloproteinases) are now also known to specifically interact with VN. Although some interactions are transient, others are long-lived and often result in multi-protein complexes. Multi-protein complexes provide several advantages: prolonging molecular interactions, sustaining local concentrations, facilitating co-stimulation of cell surface receptors and thereby enhancing cellular/biological responses. We contend that these, or equivalent, multi-protein complexes facilitate VN polyfunctionality in vivo. It is also likely that many of the species demonstrated to associate with VN in vitro, also associate with VN in vivo in similar multi-protein complexes. Thus, the predominant biological function of VN is that of a master controller of the extracellular environment; informing, and possibly instructing cells 'where' to behave, 'when' to behave and 'how' to behave (i.e., appropriately for the current circumstance).
Collapse
Affiliation(s)
- David I Leavesley
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD, Australia
| | | | | | | | | | | | | |
Collapse
|
8
|
Chollet C, Bareille R, Rémy M, Guignandon A, Bordenave L, Laroche G, Durrieu MC. Impact of Peptide Micropatterning on Endothelial Cell Actin Remodeling for Cell Alignment under Shear Stress. Macromol Biosci 2012; 12:1648-59. [DOI: 10.1002/mabi.201200167] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 07/06/2012] [Indexed: 01/29/2023]
|
9
|
Sivaraman B, Latour RA. Time-dependent conformational changes in adsorbed albumin and its effect on platelet adhesion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2745-52. [PMID: 22191731 PMCID: PMC3286649 DOI: 10.1021/la204777x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Recent studies have shown that platelets can adhere to adsorbed albumin (Alb) through a receptor-mediated mechanism, but only if the Alb undergoes more than a critical degree of adsorption-induced unfolding. The objectives of this research were to investigate whether Alb that was initially adsorbed in a manner that induced unfolding that was less than this critical level would undergo further unfolding with time and, if so, whether this would induce the onset of platelet adhesion once this critical level was exceeded. To address these questions, CD spectropolarimetry was used to monitor the structure of Alb on OH- and CH(3)-functionalized alkanethiol self-assembled monolayer surfaces, with the Alb initially adsorbed under conditions resulting in degrees of unfolding that were below this critical level, and then the adsorbed Alb layers were aged over 6 months in sterile physiological saline at 37 °C. Platelet adhesion to Alb was quantified at selected time points via a lactate dehydrogenase (LDH) assay. The results indicate that an adsorbed Alb layer does undergo further structural changes with increasing residence time and supports platelet adhesion once it unfolds beyond the previously determined critical level. These results may be relevant to the clinically observed problem of the onset of late-thrombosis, which occurs on cardiovascular implants such as drug-eluting stents.
Collapse
|
10
|
Ovod V, Scott EA, Flake MM, Parker SR, Bateman RJ, Elbert DL. Exposure of the lysine in the gamma chain dodecapeptide of human fibrinogen is not enhanced by adsorption to poly(ethylene terephthalate) as measured by biotinylation and mass spectrometry. J Biomed Mater Res A 2011; 100:622-31. [PMID: 22213354 DOI: 10.1002/jbm.a.33285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2011] [Revised: 09/27/2011] [Accepted: 09/28/2011] [Indexed: 11/08/2022]
Abstract
Conformational changes in adsorbed fibrinogen may enhance the exposure of platelet adhesive sites that are inaccessible in solution. To test this hypothesis, mass spectrometric methods were developed to quantify chemical modification of lysine residues following adsorption of fibrinogen to biomaterials. The quantitative method used an internal standard consisting of isotope-labeled fibrinogen secreted by human HepG2 cells in culture. Lysine residues in the internal standard were partially reacted with NHS-biotin. For the experimental samples, normal human fibrinogen was adsorbed to poly(ethylene terephthalate) (PET) particles. The adsorbed fibrinogen was reacted with NHS-biotin and then eluted from the particles. Constant amounts of internal standard were added to sample fibrinogen and analyzed by liquid chromatography/tandem mass spectrometry. Biotinylation of the lysine residue in the platelet-adhesive gamma chain dodecapeptide (GCDP) was quantified by comparison with the internal standard. Approximately 80% of the GCDP peptides were biotinylated when fibrinogen was reacted with NHS-biotin in solution or adsorbed onto PET. These results are generally consistent with previous antibody binding studies and suggest that other regions of fibrinogen may be crucial in promoting platelet adhesion to materials. The results do not directly address but are consistent with the hypothesis that only activated platelets adhere to adsorbed fibrinogen.
Collapse
Affiliation(s)
- Vitaliy Ovod
- Department of Biomedical Engineering and Center for Materials Innovation, Washington University, St. Louis, Missouri, USA
| | | | | | | | | | | |
Collapse
|
11
|
Soman P, Siedlecki CA. Effects of protein solution composition on the time-dependent functional activity of fibrinogen on surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10814-10819. [PMID: 21766803 DOI: 10.1021/la201111r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Protein function affects subsequent biological processes such as cell adhesion and thrombus formation. We have developed tools to detect the biological activity of fibrinogen using AFM techniques. In this work, we measure the effects of solution concentration, residence time, and protein competition with BSA on the time-dependent functional changes in adsorbed fibrinogen on mica surface. AFM probes were functionalized with monoclonal antibodies recognizing fibrinogen gamma 392-411, which includes the platelet binding dodecapeptide region. Results show good correlation between changes in biological activity of adsorbed fibrinogen at the molecular scale measured by AFM and platelet adhesion measured at a macroscale. Furthermore, the results show that inclusion of BSA into the solution moves the peak biological activity of fibrinogen to earlier time points. These results illustrate a complex and dynamic biological interface and offer new opportunities for improved insights into the molecular basis for the biological response to biomaterials.
Collapse
Affiliation(s)
- Pranav Soman
- Department of Bioengineering, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA
| | | |
Collapse
|
12
|
Sivaraman B, Latour RA. Delineating the roles of the GPIIb/IIIa and GP-Ib-IX-V platelet receptors in mediating platelet adhesion to adsorbed fibrinogen and albumin. Biomaterials 2011; 32:5365-70. [PMID: 21529934 DOI: 10.1016/j.biomaterials.2011.04.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Accepted: 04/05/2011] [Indexed: 11/16/2022]
Abstract
Platelet adhesion to adsorbed plasma proteins, such as fibrinogen (Fg), has been conventionally thought to be mediated by the GPIIb/IIIa receptor binding to Arg-Gly-Asp (RGD)-like motifs in the adsorbed protein. In previous studies, we showed that platelet adhesion response to adsorbed Fg and Alb was strongly influenced by the degree of adsorption-induced protein unfolding and that platelet adhesion was only partially blocked by soluble RGD, with RGD-blocked platelets adhering without activation. Based on these results, we hypothesized that in addition to the RGD-specific GPIIb/IIIa receptor, which mediates both adhesion and activation, a non-RGD-specific receptor set likely also plays a role in platelet adhesion (but not activation) to both Fg and albumin (Alb). To identify and elucidate the role of these receptors, in addition to GPIIb/IIIa, we also examined the GPIb-IX-V receptor complex, which has been shown to mediate platelet adhesion (but not activation) in studies by other groups. The platelet suspension was pretreated with either a GPIIb/IIIa-antagonist drug Aggrastat(®) or monoclonal antibodies 6B4 or 24G10 against GPIb-IX-V prior to adhesion on Fg- and Alb-coated OH- and CH(3)-functionalized alkanethiol self-assembled monolayer surfaces. The results revealed that GPIIb/IIIa is the primary receptor set involved in platelet adhesion to adsorbed Fg and Alb irrespective of their degree of adsorption-induced unfolding, while the GPIb-IX-V receptor complex plays an insignificant role. Overall, these studies provide novel insights into the molecular-level mechanisms mediating platelet interactions with adsorbed plasma proteins, thereby assisting the biomaterials field develop potent strategies for inhibiting platelet-protein interactions in the design of more hemocompatible cardiovascular biomaterials and effective anti-thrombotic therapies.
Collapse
Affiliation(s)
- Balakrishnan Sivaraman
- Department of Biomedical Engineering, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | | |
Collapse
|
13
|
Le Clair S, Nguyen K, Chen Z. Sum Frequency Generation Studies on Bioadhesion: Elucidating the Molecular Structure of Proteins at Interfaces. THE JOURNAL OF ADHESION 2009; 85:484-511. [PMID: 20625467 PMCID: PMC2898208 DOI: 10.1080/00218460902996374] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The study of bioadhesion is significant to applications in a variety of scientific fields. Techniques that are surface sensitive need to be utilized to examine these kinds of systems because bioadhesion occurs at the interface between two surfaces. Recently, Sum Frequency Generation (SFG) has been applied to investigate different bioadhesive processes because of its intrinsic surface specificity, excellent sensitivity and its ability to perform experiments in situ. SFG studies on the bioadhesion of fibrinogen, factor XII and mefp-3 on various surfaces will be discussed in this review.
Collapse
Affiliation(s)
| | | | - Zhan Chen
- Department of Chemistry, 930 North University Avenue, University of Michigan, Ann Arbor, Michigan, 48109, USA
| |
Collapse
|
14
|
Soman P, Rice Z, Siedlecki CA. Measuring the time-dependent functional activity of adsorbed fibrinogen by atomic force microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:8801-8806. [PMID: 18616311 DOI: 10.1021/la801227e] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In this work, we measured time-dependent functional changes in adsorbed fibrinogen by measuring antigen-antibody debonding forces with atomic force microscopy (AFM). AFM probes were functionalized with monoclonal antibodies recognizing fibrinogen gamma 392-411, which includes the platelet binding dodecapeptide region. These probes were used to collect force measurements between the antibody and fibrinogen on mica substrates and the probability of antigen recognition was calculated. Statistical analysis showed that the probability of antibody-antigen recognition peaked at approximately 45 min postadsorption and decreased with increasing residence time. Macroscale platelet adhesion measurements on these mica substrates were determined to be greatest at fibrinogen residence times of approximately 45 min, which correlated well with the functional activity of adsorbed fibrinogen as measured by the modified AFM probes. These results demonstrate the utility of this approach for measuring protein function at or near the molecular scale and offers new opportunities for improved insights into the molecular basis for the biological response to biomaterials.
Collapse
Affiliation(s)
- Pranav Soman
- Department of Bioengineering and Surgery, The Pennsylvania State University College of Medicine, Hershey Pennsylvania 17033, USA
| | | | | |
Collapse
|
15
|
Abstract
Implantable medical devices are increasingly important in the practice of modern medicine. Unfortunately, almost all medical devices suffer to a different extent from adverse reactions, including inflammation, fibrosis, thrombosis and infection. To improve the safety and function of many types of medical implants, a major need exists for development of materials that evoked desired tissue responses. Because implant-associated protein adsorption and conformational changes thereafter have been shown to promote immune reactions, rigorous research efforts have been emphasized on the engineering of surface property (physical and chemical characteristics) to reduce protein adsorption and cell interactions and subsequently improve implant biocompatibility. This brief review is aimed to summarize the past efforts and our recent knowledge about the influence of surface functionality on protein:cell:biomaterial interactions. It is our belief that detailed understandings of bioactivity of surface functionality provide an easy, economic, and specific approach for the future rational design of implantable medical devices with desired tissue reactivity and, hopefully, wound healing capability.
Collapse
Affiliation(s)
- Paul Thevenot
- Bioengineering Department, University of Texas at Arlington, PO Box 19138, Arlington, TX 76019-0138, USA
| | | | | |
Collapse
|
16
|
Massa TM, McClung WG, Yang ML, Ho JYC, Brash JL, Santerre JP. Fibrinogen adsorption and platelet lysis characterization of fluorinated surface-modified polyetherurethanes. J Biomed Mater Res A 2007; 81:178-85. [PMID: 17120208 DOI: 10.1002/jbm.a.30936] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A polyetherurethane (PU) was modified using fluorinated surface-modifying macromolecules (SMMs). A double radiolabel method was used simultaneously to measure the number of adhered platelets ((51)Cr) and the quantity of adsorbed Fg ((125)I), in a cone-and-plate instrument. The objectives were to determine if adsorbed Fg levels correlated to platelet adhesion on the surfaces, and to assess if any reductions in platelet adhesion for the SMM-treated surfaces resulted from surface-induced platelet lysis, rather than changes directly related to lower platelet activation and attachment on the novel surfaces. Platelet lysis was determined from lactate dehydrogenase (LDH) and unbound (51)Cr released into plasma isolated from whole blood exposed to test materials. The corresponding Fg adsorption, evaluated under the same platelet adhesion conditions, did not account for the reduced platelet adhesion on the treated surfaces. LDH and (51)Cr platelet release were very low and indicated no statistically significant differences between the materials. It was therefore concluded that platelet lysis did not contribute to the reduction in platelet adhesion characteristic observed on the SMM-treated surfaces. More importantly, the work emphasizes that the platelet activation cannot be inferred to by assessing the quantity of fibrinogen as is commonly done in the literature. The finding suggests a much more complex mechanism of action for the SMM surface modifiers. On-going work is investigating other Fg parameters such as protein binding affinity and protein conformational state in order to establish the mechanism by which the fluorinated surface modifiers may be reducing platelet adhesion via intermediary changes in initial protein adsorption.
Collapse
Affiliation(s)
- T M Massa
- Department of Chemical Engineering and Applied Science, University of Toronto, Ontario, Canada
| | | | | | | | | | | |
Collapse
|
17
|
Schleicher I, Parker A, Leavesley D, Crawford R, Upton Z, Xiao Y. Surface Modification by Complexes of Vitronectin and Growth Factors for Serum-Free Culture of Human Osteoblasts. ACTA ACUST UNITED AC 2005; 11:1688-98. [PMID: 16411814 DOI: 10.1089/ten.2005.11.1688] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Cell attachment, expansion, and migration in three-dimensional biomaterials are crucial steps for effective delivery of osteogenic cells into bone defects. Complexes composed of vitronectin (VN), insulin-like growth factors (IGFs), and insulin growth factor-binding proteins (IGFBPs) have been reported to enhance cell attachment, proliferation, and migration in a variety of cell lines in vitro. The aim of this study was to examine whether prebound complexes of VN and IGFs +/- IGFBPs could facilitate human osteoblast serum-free expansion in vitro and enhance cell attachment, proliferation, and migration in three-dimensional biomaterial constructs. Human osteoblasts derived from alveolar bone chips and the established human osteoblast cell line Saos-2 were used. These cells were seeded on tissue culture plates and porous scaffolds of type I collagen sponges and polyglycolic acid (PGA), which had been coated with VN +/- IGFBP-5 +/- IGF-I. Cell attachment, proliferation, and migration were evaluated by cell counting, confocal microscopy, and scanning electron microscopy. The number of attached human osteoblasts was significantly higher in VN-coated polystyrene culture dishes. Furthermore, significant increases in cell proliferation were observed when growth factors were bound to these surfaces in the presence of VN. In the two scaffold materials examined, greater cell attachment was found in type I collagen sponges compared with PGA scaffolds. However, coating the scaffolds with complexes composed of VN + IGF-I or VN + IGFBP-5 + IGF-I enhanced cell attachment on PGA. Moreover, the presence of VN + IGFBP-5 + IGF-I resulted in significantly greater osteoblast migration into deep pore areas as compared with untreated scaffolds or scaffolds treated with fetal calf serum. These results demonstrated that complexes of VN + IGFBP-5 + IGF-I can be used to expand osteoblasts in vitro under serum-free conditions and enhance the attachment and migration of human osteoblasts in three-dimensional culture. This in turn suggests a potential application in surface modification of biomaterials for tissue reconstruction.
Collapse
|
18
|
|
19
|
Wu Y, Simonovsky FI, Ratner BD, Horbett TA. The role of adsorbed fibrinogen in platelet adhesion to polyurethane surfaces: A comparison of surface hydrophobicity, protein adsorption, monoclonal antibody binding, and platelet adhesion. J Biomed Mater Res A 2005; 74:722-38. [PMID: 16037938 DOI: 10.1002/jbm.a.30381] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ten specially synthesized polyurethanes (PUs) were used to investigate the effects of surface properties on platelet adhesion. Surface composition and hydrophilicity, fibrinogen (Fg) and von Willebrand's factor (vWf) adsorption, monoclonal anti-Fg binding, and platelet adhesion were measured. PUs preadsorbed with afibrinogenemic plasma or serum exhibited very low platelet adhesion, while adhesion after preadsorption with vWf deficient plasma was not reduced, showing that Fg is the key plasma protein mediating platelet adhesion under static conditions. Platelet adhesion to the ten PUs after plasma preadsorption varied greatly, but was only partially consistent with Fg adsorption. Thus, while very hydrophilic PU copolymers containing PEG that had ultralow Fg adsorption also had very low platelet adhesion, some of the more hydrophobic PUs had relatively high Fg adsorption but still exhibited lower platelet adhesion. To examine why some PUs with high Fg adsorption had lower platelet adhesion, three monoclonal antibodies (mAbs) that bind to sites in Fg thought to mediate platelet adhesion were used. The antibodies were: M1, specific to gamma-chain C-terminal; and R1 and R2, specific to RGD containing regions in the alpha-chain N- and C-terminal, respectively. Platelet adhesion was well correlated with M1 binding, but not with R1 or R2 binding. When these mAbs were incubated with plasma preadsorbed surfaces, they blocked adhesion to variable degrees. The ability of the R1 and R2 mAbs to partially block adhesion to adsorbed Fg suggests that RGD sites in the alpha chain may also be involved in mediating platelet adhesion and act synergistically with the C-terminal of the gamma-chain.
Collapse
Affiliation(s)
- Yuguang Wu
- Department of Bioengineering, Box 351750, University of Washington, Seattle, Washington 98195, USA
| | | | | | | |
Collapse
|
20
|
Tsai WB, Grunkemeier JM, Horbett TA. Variations in the ability of adsorbed fibrinogen to mediate platelet adhesion to polystyrene-based materials: a multivariate statistical analysis of antibody binding to the platelet binding sites of fibrinogen. J Biomed Mater Res A 2004; 67:1255-68. [PMID: 14624512 DOI: 10.1002/jbm.a.20024] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Platelet adhesion to the surfaces of biomaterials preadsorbed with plasma previously has been shown to be mediated exclusively by surface-bound fibrinogen and does not seem to involve the other adhesion proteins in plasma (Tsai et al., J Biomed Mater Res 2002;60:348-359). In this study, the influence of surface-bound fibrinogen on platelet adhesion to five different types of polystyrene-based microtiter plates preadsorbed with plasma was analyzed relative to the amount of adsorbed fibrinogen and monoclonal antibody binding to the adsorbed fibrinogen. There was no significant correlation between platelet adhesion and the absolute amount of adsorbed fibrinogen. However, platelet adhesion was positively correlated to the ability of the adsorbed fibrinogen to bind three types of monoclonal antibodies. The antibodies used bound to the sites on fibrinogen thought to be involved in platelet binding (the two gamma chain C-terminal dodecapeptides and the RGDF and RGDS sequences in each of the Aalpha chains). A partial least-squares calibration model was used to analyze the relative importance of these binding sites in fibrinogen to platelet adhesion. The gamma chain C-terminal dodecapeptide was shown to be the most important site in adsorbed fibrinogen in mediating platelet adhesion.
Collapse
Affiliation(s)
- Wei-Bor Tsai
- Department of Bioengineering, Box 351750, University of Washington, Seattle, Washington 98195, USA
| | | | | |
Collapse
|
21
|
Abstract
The interaction of proteins with solid surfaces is a fundamental phenomenon with implications for nanotechnology, biomaterials and biotechnological processes. Kinetic and thermodynamic studies have long indicated that significant conformational changes may occur as a protein encounters a surface; new techniques are measuring and modeling these changes. Combinatorial and directed evolution techniques have created new peptide sequences that bind specifically to solid surfaces, similar to the natural proteins that regulate crystal growth. Modeling efforts capture kinetics and thermodynamics on the colloidal scale, but detailed treatments of atomic structure are still in development and face the usual challenges of protein modeling. Opportunities abound for fundamental discovery, as well as breakthroughs in biomaterials, biotechnology and nanotechnology.
Collapse
Affiliation(s)
- Jeffrey J Gray
- Chemical & Biomolecular Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.
| |
Collapse
|
22
|
Hersel U, Dahmen C, Kessler H. RGD modified polymers: biomaterials for stimulated cell adhesion and beyond. Biomaterials 2003; 24:4385-415. [PMID: 12922151 DOI: 10.1016/s0142-9612(03)00343-0] [Citation(s) in RCA: 1731] [Impact Index Per Article: 82.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Since RGD peptides (R: arginine; G: glycine; D: aspartic acid) have been found to promote cell adhesion in 1984 (Cell attachment activity of fibronectin can be duplicated by small synthetic fragments of the molecule, Nature 309 (1984) 30), numerous materials have been RGD functionalized for academic studies or medical applications. This review gives an overview of RGD modified polymers, that have been used for cell adhesion, and provides information about technical aspects of RGD immobilization on polymers. The impacts of RGD peptide surface density, spatial arrangement as well as integrin affinity and selectivity on cell responses like adhesion and migration are discussed.
Collapse
Affiliation(s)
- Ulrich Hersel
- Institut für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstr. 4, D-85747, Garching, Germany
| | | | | |
Collapse
|
23
|
Tzoneva R, Heuchel M, Groth T, Altankov G, Albrecht W, Paul D. Fibrinogen adsorption and platelet interactions on polymer membranes. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 13:1033-50. [PMID: 12462462 DOI: 10.1163/156856202760319171] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The hemocompatibility of four different wettable polymer membranes, namely Cuprophan (CE), polyether-polycarbonate (PC-PE), polysulfone (PSU), and polyetherimide (PEI), was investigated with respect to fibrinogen (Fng) adsorption and platelet adhesion/activation. In order to estimate the polar and dispersion components of the surface free energy, contact angles using water/vapor and water/n-hexadecane systems were measured. Adsorption of fibrinogen was studied using fluorescence-labeled protein. The adsorption isotherms showed that the amount and the affinity of adsorbed Fng increased with decreasing surface wettability of the membranes, which correlates with the dispersion and polar components of the surface free energy. The conformational changes of adsorbed Fng were detected by measuring the difference between monoclonal antibody binding to the conformation-sensitive epitope in the D-domain and the binding of polyclonal anti-Fng antibody. The anticipated conformational/orientational changes were greater for PEI and PSU membranes (the least wettable membranes) and negligible for the more wettable PC-PE and CE membranes. In addition, a possible relationship with the degree of platelet activation was found, showing negligible platelet adhesion on PC-PE and CE, but high platelet adhesion on PEI and PSU. Furthermore, platelets were spread to a large extent on PEI, while the formation of aggregates was observed on PSU. This may correspond to the anticipated differences in the conformational state of Fng on both membranes.
Collapse
Affiliation(s)
- Rumiana Tzoneva
- GKSS Forschungszentrum, Institut für Chemie, Abteilung Membranforschung, Teltow, Germany
| | | | | | | | | | | |
Collapse
|
24
|
Abstract
Despite being inert and nontoxic, implanted biomaterials often trigger adverse foreign body reactions such as inflammation, fibrosis, infection, and thrombosis. With regard to the inflammatory responses to biomaterial implants, it was previously found that a crucial precedent event was the spontaneous adsorption and denaturation of fibrinogen on implant surfaces. It was further found that interactions between the phagocyte integrin Mac-1 (CD11b/CD18) and one short sequence within the fibrinogen D domain (gamma 190-202; P1) at least partially explained phagocyte accumulation on implant surfaces. However, the reason that adsorbed fibrinogen is proinflammatory--while soluble fibrinogen clearly is not--remained obscure. In this study, therefore, the question of how fibrinogen is converted to a proinflammatory state when adsorbed to biomaterial surfaces is investigated. In soluble fibrinogen, the 13 amino acid P1 sequence was found to be hidden. However, the adsorption and denaturation of fibrinogen on the surfaces of commonly used biomaterials lead to the exposure of P1 and a second neo-epitope, gamma 377-395 (P2), which also interacts with Mac-1 and is similarly occult in the soluble protein. The extent of biomaterial-mediated P1 and P2 exposure appears directly related to the severity of inflammatory responses to a test panel of biomaterials. Finally, thrombin-mediated conversion of fibrinogen to fibrin also exposes both P1 and P2 epitopes. These observations may help explain both the inflammation caused by many types of implanted biomaterials and that which occurs naturally following thrombotic events. (Blood. 2001;98:1231-1238)
Collapse
Affiliation(s)
- W J Hu
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | | | | | | |
Collapse
|
25
|
Grunkemeier JM, Tsai WB, Alexander MR, Castner DG, Horbett TA. Platelet adhesion and procoagulant activity induced by contact with radiofrequency glow discharge polymers: roles of adsorbed fibrinogen and vWF. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 51:669-79. [PMID: 10880115 DOI: 10.1002/1097-4636(20000915)51:4<669::aid-jbm15>3.0.co;2-#] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The potential hemocompatibility of radiofrequency glow discharge (RFGD) polymers made by copolymerization of mixtures of hexafluoropropene and ethylene (C(3)F(6)/C(2)H(4)) or acrylic acid and 1,7-octadiene was investigated using in vitro assays for platelet adhesion and platelet catalyzed thrombin generation. Thrombin generation rate normalized to platelet number was used as a measurement of platelet activation (procoagulant activity). RFGD polymers produced by copolymerization of acrylic acid and 1, 7-octadiene contained varying amounts of carboxylic acid species as determined by electron spectroscopy for chemical analysis (ESCA). These polymers induced little variation in platelet adhesion, thrombin generation, or platelet activation. RFGD polymerization of C(3)F(6) and C(2)H(4) resulted in polymers with varying proportions of fluorinated species, as determined by ESCA. Fibrinogen adsorption from plasma was maximal on a polymer made with 25% C(3)F(6) (75% C(2)H(4)) in the feed. However von Willebrand factor (vWF) adsorption was greater on polymers made with increased %C(3)F(6) in the feed. Platelet adhesion decreased with increasing %C(3)F(6) in the feed. Thrombin generation was lowest for platelets adherent to polymers made from both C(3)F(6) and C(2)H(4). Therefore, procoagulant activity of platelets increased for polymers made with increased %C(3)F(6) in the feed, similar to the trend in vWF adsorption. These findings suggest that increased incorporation of fluorinated species into RFGD polymers leads to decreased platelet adhesion and increased platelet activation (which is possibly due to increased vWF adsorption).
Collapse
Affiliation(s)
- J M Grunkemeier
- Department of Bioengineering, Box 351750, University of Washington, Seattle Washington 98195, USA
| | | | | | | | | |
Collapse
|
26
|
Abstract
It is now well accepted that the adsorption of proteins to solid supports sometimes involves surface-mediated unfolding. A detailed understanding of the adsorption and surface-mediated unfolding process is lacking. We selected a well studied protein, horse heart cytochrome c, and a weakly ionic support to examine some of the characteristics of protein adsorption under near-physiological conditions. We used high-performance liquid chromatography (HPLC) to investigate the effect of temperature on surface-mediated unfolding. Samples of cytochrome c were introduced to an anionic support, and a NaCl gradient was used to desorb the protein at different times and temperatures. The profiles and retention times were monitored to examine the adhesive properties of cytochrome c to the anionic support. We found that protein retention increased with time at temperatures as low as 0 degrees C, and a significant loss of cytochrome c occurred between 55 degrees C and 70 degrees C. The loss of recovery of cytochrome c indicates irreversible surface-mediated unfolding. The changes in retention time may indicate more subtle transitions, including reversible surface-mediated unfolding of cytochrome c. These results suggest that perturbations in the structure as well as unfolding of cytochrome c can be detected at a lower temperature on an anionic surface than in solution thereby acting like a catalyst for protein unfolding.
Collapse
Affiliation(s)
- C W Herbold
- Department of Chemical Sciences, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | | | | |
Collapse
|
27
|
Balasubramanian V, Grusin NK, Bucher RW, Turitto VT, Slack SM. Residence-time dependent changes in fibrinogen adsorbed to polymeric biomaterials. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1999; 44:253-60. [PMID: 10397927 DOI: 10.1002/(sici)1097-4636(19990305)44:3<253::aid-jbm3>3.0.co;2-k] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
It has generally been accepted that biomaterials adsorbing the least amount of the plasma protein fibrinogen following exposure to blood will support less platelet adhesion and therefore exhibit less thrombogenicity. Several studies suggest, however, that the conformation or orientation of immobilized fibrinogen rather than the total amount adsorbed plays an important role in determining the blood compatibility of biomaterials. The purpose of this study was to investigate time-dependent functional changes in fibrinogen adsorbed to polytetrafluoroethylene (PTFE), polyethylene (PE), and silicone rubber (SR). Fibrinogen was adsorbed to these materials for 1 min and then allowed to 'reside" on the surfaces for up to 2 h prior to assessing its biological activity. Changes in fibrinogen reactivity were determined by measuring the adhesion of 51Cr-labeled platelets, the binding of a monoclonal antibody (mAb) directed against an important functional region of the fibrinogen molecule (the gamma-chain dodecapeptide sequence 400-411), and the ability of blood plasma to displace previously adsorbed fibrinogen. Platelet adhesion differed among the polymeric materials studied, and PTFE and PE samples exhibited a small decrease in adhesion with increasing fibrinogen residence time. Platelet adhesion to SR was the least among all materials studied and showed no variation with residence time. When using PTFE and SR as substrates, mAb recognition of adsorbed fibrinogen did not change with residence time whereas that on PE decreased slightly. The mAb binding was least to fibrinogen adsorbed to SR, which is in agreement with the platelet adhesion results. Finally, the ability of plasma to displace previously adsorbed fibrinogen decreased dramatically with increasing residence time on all materials. These in vitro studies support the hypothesis that fibrinogen undergoes biologically significant conformational changes upon adsorption to polymeric biomaterials, a phenomenon that may contribute to the hemocompatibility of the materials following implantation in the body.
Collapse
Affiliation(s)
- V Balasubramanian
- Department of Biomedical Engineering, The University of Memphis, Tennessee 38152-6582, USA
| | | | | | | | | |
Collapse
|
28
|
Horbett TA, Cooper KW, Lew KR, Ratner BD. Rapid postadsorptive changes in fibrinogen adsorbed from plasma to segmented polyurethanes. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1998; 9:1071-87. [PMID: 9806446 DOI: 10.1163/156856298x00334] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fibrinogen adsorbed to biomaterials plays a key role in mediating platelet interactions that can lead to blood clotting so its behavior on surfaces is of fundamental interest. In previous work showing that fibrinogen adsorbed to surfaces quickly becomes non-displaceable upon exposure to blood plasma, the fibrinogen was adsorbed from buffer, so we performed new studies in which the displaceability of fibrinogen adsorbed from plasma was characterized. Fibrinogen was adsorbed from 1% plasma to seven different surfaces for 1-64 min and then transferred to 100% plasma lacking radiolabeled fibrinogen and the amount adsorbed before and after transfer measured. The surfaces were glass, Silicone rubber, and five different polyurethanes. As adsorption time increased, the fibrinogen became increasingly resistant to displacement during the 100% plasma step, but the rate of increase in resistance varied greatly with surface type. Fibrinogen adsorbed from 1% plasma evidently undergoes rapid, surface dependent transitions. This work shows that the transitions that occur when the fibrinogen is adsorbed from blood plasma are similar to what we have previously observed for fibrinogen adsorbed from buffer.
Collapse
Affiliation(s)
- T A Horbett
- Department of Bioengineering, University of Washington, Seattle 98195, USA
| | | | | | | |
Collapse
|
29
|
Peckham SM, Turitto VT, Glantz J, Puryear H, Slack SM. Hemocompatibility studies of surface-treated polyurethane-based chronic indwelling catheters. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1997; 8:847-58. [PMID: 9342651 DOI: 10.1163/156856297x00047] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The objectives of this research were to evaluate and compare the interactions of several polyurethane-based central venous catheter materials with blood. Specifically, measurements of fibrinogen adsorption, platelet adhesion, kallikrein generation, and fibrinopeptide A (FPA) release were performed. The catheter materials examined in this study included: platinum-cured, 50 shore A durometer, barium sulfate-filled, silicone (SI); Tecoflex EG85A-B20 polyurethane (PU); PU catheters whose outer surface had been impregnated with ion beam-deposited silver atoms (AgI and AgII); PU catheters coated with a hydrophilic, polyacrylic acid polymer (UC); PU catheters coated with an air-cured PTFE emulsion (CS); and PU catheters coated with an aminofunctional dimethylsiloxane copolymer (JG). The time course of fibrinogen adsorption from plasma to the SI, JG, PU, and CS materials was similar, with CS exhibiting the least amount of adsorbed fibrinogen after 1 h (65 +/- 4.7 ng cm-2) and PU the greatest (144 +/- 16.5 ng cm-2). After 90 min of contact, AgI and AgII exhibited the greatest number of adherent platelets, levels that were approximately two to three times higher than those on the other catheter materials. With the exception of UC and PU, which caused kallikrein generation levels approximately half that of the positive (glass) control, little kallikrein formation was observed for any of the materials relative to the negative control. Finally, FPA generation was greatest using the SI, CS, and PU materials, with the latter causing the production of almost four times the amount of FPA as the negative control. This preliminary assessment of the hemocompatibility of the various catheters suggests that the surface treatments did not adversely affect their interactions with blood components; further investigations of these materials are therefore warranted in order to completely characterize their behavior prior to use in clinical situations.
Collapse
Affiliation(s)
- S M Peckham
- Department of Biomedical Engineering, University of Memphis, TN 38152, USA
| | | | | | | | | |
Collapse
|
30
|
Grunkemeier J, Wan C, Horbett T. Changes in binding affinity of a monoclonal antibody to a platelet binding domain of fibrinogen adsorbed to biomaterials. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1997; 8:189-209. [PMID: 8996693 DOI: 10.1163/156856296x00246] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Previously, we found that when fibrinogen-coated polyurethanes resided in a buffer for a period of time (the 'residence time') platelet adhesion to these materials decreased. Other changes in adsorbed fibrinogen such as decreases in polyclonal antibody binding and SDS elutability supported the conclusion that fibrinogen undergoes postadsorptive conformational changes. Subsequently we measured the binding of monoclonal antibodies to the three putative platelet binding sites on fibrinogen, using a single mid-range concentration of antibody. We found that binding of a monoclonal antibody to the platelet binding site at the C-terminus of the gamma chain of fibrinogen changed little with residence time, while binding of monoclonal antibodies to the other two putative binding sites on fibrinogen either increased with residence time (RGDF at A alpha 95-98), or first increased and then decreased with residence time (RGDS at A alpha 572-575). In the current study, we measured antibody binding affinity, Ka, by measuring antibody binding at a series of antibody concentrations. This is a more sensitive method for detecting changes in adsorbed fibrinogen than measuring antibody binding from a single antibody concentration. The Ka was determined for two antibodies, M1 (4A5), which binds to a platelet binding domain of fibrinogen (gamma 402-411) and R1 (155 B 1616), which binds to residues 87-100 of the A alpha chain (containing an RGDF site). A summary of the results for the M1 antibody are as follows. The Ka was higher for M1 binding to fibrinogen adsorbed to Immulon I than to Biomer, Biospan or poly(ethylene terephthalate), suggesting that fibrinogen adsorbed to Immulon I is more platelet adhesive than fibrinogen adsorbed to the other polymers. On Biospan, the Ka decreased from 2.8 x 10(9) to 1.0 x 10(9) M-1 after a 24 h 37 degrees C residence time, which correlated with the decrease in platelet adhesiveness of adsorbed fibrinogen observed previously under these conditions. The change in Ka was greater when adsorbed fibrinogen was kept under denaturing conditions. For example, the Ka decreased from 2.8 x 10(9) to 0.8 x 10(9) M-1 after a 1 h 70 degrees C residence time whereas it remained approximately the same, 2.9 x 10(9) M-1, after a 24 h 0 degree C residence time.
Collapse
Affiliation(s)
- J Grunkemeier
- Department of Chemical Engineering, Seattle, WA 98195, USA
| | | | | |
Collapse
|
31
|
Grunkemeier JM, Horbett TA. Fibrinogen adsorption to receptor-like biomaterials made by pre-adsorbing peptides to polystyrene substrates. J Mol Recognit 1996; 9:247-57. [PMID: 8938598 DOI: 10.1002/(sici)1099-1352(199605)9:3<247::aid-jmr336>3.0.co;2-h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Two peptides from the ligand-binding site of the platelet receptor GPIIb/IIIa, residues 296-306 of GPIIb, designated B12 by D'Souza et al. (1991), and 300-311 of GPIIb, designated G13 by Taylor et al., (1992), as well as two control peptides, designated C14 and C20, were adsorbed to treated polystyrene substrates. Fibrinogen adsorption to the peptide-coated substrates was characterized. The specificity of I-125 labeled fibrinogen binding to the peptide-coated substrates was investigated by measuring the amount of fibrinogen adsorbed to each substrate and the inhibition of fibrinogen binding by RGDS peptide, bovine serum albumin, a divalent ion chelator (ethylene diamine tetra-acetic acid disodium salt), unlabeled fibrinogen and the B12 peptide. The results show that non-specific binding of fibrinogen to the B12-coated substrate is predominant under most conditions. Binding of monoclonal antibodies to fibrinogen adsorbed to the peptide coated substrates was characterized. The failure of several antibodies to bind fibrinogen adsorbed to the B12 substrate suggested that adsorption of fibrinogen to the B12-coated substrate alters its conformation relative to fibrinogen adsorbed to the bare substrate.
Collapse
Affiliation(s)
- J M Grunkemeier
- Center for Bioengineering, University of Washington, Seattle 98195-1750, USA
| | | |
Collapse
|